In a Bourbon Manhattan, which type of vermouth is used?

In a Bourbon Manhattan, sweet vermouth is the correct choice because it complements the rich and robust flavors of bourbon. Manhattan cocktails are traditionally made with sweet vermouth, which adds a touch of sweetness and complexity to the drink, balancing the strong, full-bodied characteristics of bourbon. The sweetness of the vermouth enhances the overall flavor profile, bringing a harmonious blend of herbal and aromatic qualities that is characteristic of a classic Manhattan.

On the other hand, dry vermouth and extra dry vermouth are typically associated with cocktails that require a lighter, less sweet flavor profile, such as a Dry Martini. Using no vermouth would deviate from the traditional preparation of a Manhattan, making it simply bourbon with no added complexity from the vermouth. Therefore, sweet vermouth is integral to creating the distinctive taste of a Bourbon Manhattan.